/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.core.registry;

import org.mule.runtime.core.api.registry.ServiceRegistry;

import com.google.common.collect.ImmutableList;

import java.util.Collection;
import java.util.ServiceLoader;

/**
 * Implementation of {@link ServiceRegistry} that uses standard {@link java.util.ServiceLoader} to get the providers
 *
 * @since 3.7.0
 */
public class SpiServiceRegistry implements ServiceRegistry {

  /**
   * If {@code classLoader} is {@code null}, then the current {@link Thread#getContextClassLoader()} will be used {@inheritDoc}
   */
  @Override
  public <T> Collection<T> lookupProviders(Class<T> providerClass, ClassLoader classLoader) {
    if (classLoader == null) {
      classLoader = Thread.currentThread().getContextClassLoader();
    }

    return ImmutableList.copyOf(ServiceLoader.load(providerClass, classLoader).iterator());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public <T> Collection<T> lookupProviders(Class<T> providerClass) {
    return ImmutableList.copyOf(ServiceLoader.load(providerClass).iterator());
  }
}
